scholarly journals Studies on oxygen mass transfer in stirred bioreactors 2: Suspensions of bacteria, yeasts and fungis

2003 ◽  
Vol 57 (6) ◽  
pp. 276-287 ◽  
Author(s):  
Anca-Irina Galaction ◽  
Corneliu Oniscu ◽  
Dan Cascaval
Keyword(s):  
Mass Transfer ◽  
Mass Transfer Rate ◽  
Power Input ◽  
Specific Power ◽  
Oxygen Mass Transfer ◽  
Stirred Bioreactor ◽  
Operating Variables ◽  
Surface Aeration ◽  
Velocity Surface ◽  
Specific Power Input

The aim of these experiments is to study the oxygen mass transfer rate by means of the mass transfer coefficient, for a stirred bioreactor and different fermentation broths, using a large domain of operating variables. For quantifying the effects of the considered factors (concentration and morphology of the biomass, specific power input, superficial air velocity surface aeration) on k\a, the experiments were carried out for non-respirating biomass suspensions of Propionibacterium shermanii Saccharomyces cerevisiae and Penicillium chrysogenum, mycelial aggregates (pellets) and free mycelia morphological structures.

Multiphase microreactors with intensification of oxygen mass transfer rate and mixing performance for bioprocess development

2018 ◽  
Vol 139 ◽  
pp. 57-67 ◽  
Author(s):  
Susanna Lladó Maldonado ◽  
Detlev Rasch ◽  
Alice Kasjanow ◽  
Dominique Bouwes ◽  
Ulrich Krühne ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Transfer Rate ◽  
Mass Transfer Rate ◽  
Oxygen Mass Transfer ◽  
Bioprocess Development ◽  
Mixing Performance

The Experiment Study on the Void Fraction in PPG Solution

2012 ◽  
Vol 455-456 ◽  
pp. 815-819
Author(s):  
Qian Qiao Chen ◽  
Qin Zhong ◽  
Li Qi ◽  
Qun Qun Cheng ◽  
Lu Wang ◽  
...  
Keyword(s):  
Gas Phase ◽  
Scale Up ◽  
Power Input ◽  
Gas Holdup ◽  
Specific Power ◽  
Experiment Study ◽  
Operation Parameter ◽  
Polymerization Reactor ◽  
Specific Power Input ◽  
Polyether Polyol

Using the three-layer impellers with big size diameter in an unbaffled elliptic bottom stirred tank，the gas holdup (ε) was studied in the systems of air-polyether polyol (PPG). The results indicate that the gas holdup in the air-PPG system is higher, it increase with the superficial gas phase velocity (Vs) and specific power input (Pm) increase, and decrease as the temperature increase. The influence is severely when the temperature is below 100°C, and is weak above 100 °C.The conclusions give reference for choosing the operation parameter and designing and scale-up of PPG polymerization reactor.

Enhancement of oxygen mass transfer rate in the presence of nanosized particles

2007 ◽  
Vol 62 (24) ◽  
pp. 7391-7398 ◽  
Author(s):  
Endre Nagy ◽  
Tivadar Feczkó ◽  
Balázs Koroknai
Keyword(s):  
Mass Transfer ◽  
Transfer Rate ◽  
Mass Transfer Rate ◽  
Oxygen Mass Transfer ◽  
Nanosized Particles

scholarly journals The effect of n-dodecane addition on oxygen transfer in stirred bioreactors for Saccharomyces cerevisiae broths

2005 ◽  
Vol 11 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Anca-Irina Galaction ◽  
Elena Folescu ◽  
Dan Cascaval
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Mass Transfer ◽  
Oxygen Transfer ◽  
Transfer Rate ◽  
Considerable Increase ◽  
Mass Transfer Rate ◽  
Yeast Cells ◽  
Oxygen Mass Transfer ◽  
Oxygen Vector ◽  
Stirred Bioreactors

The previous works on simulated and P. shermanii broths were continued and developed for Saccharomyces cerevisiae broths. The obtained results indicated the considerable increase of k?a in the presence of n-dodecane as an oxygen-vector, but the magnitude of this effect had to be correlated with the biomass characteristics, especially with hydrophobicity. Due to the higher affinity of yeast cells for hydrocarbon droplets, increase of the oxygen mass transfer rate was lower than that recorded for simulated broths or bacterial suspensions.

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